Native Plants
Q. Who is Mr. Smarty Plants?
A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
Ask Mr. Smarty Plants
Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.
rate this answer
Tuesday - May 01, 2012
From: West Lake Hills, TX
Region: Southwest
Topic: Invasive Plants, Non-Natives, Plant Identification, Problem Plants
Title: How Can I Tell an Invasive Thistle from a Native
Answered by: Mike Tomme
QUESTION:
Mr Smarty Plants, I have some thistles coming up in my yard. I'd like to keep them if they are native, but not if they are invasive or non-native. How can I tell? My yard is a wild area in West Lake Hills, TX.ANSWER:
It would seem you have asked a simple question, but in reality you haven't. As you can see from this previous Mr. Smarty Plants answer, there are quite a few different plants that occur in central Texas that can be called some sort of thistle. As this answer makes clear, it can be difficult to tell the natives and non-natives apart and it requires a fair amount of research.
To help simplify mattes, I am going to assume that the thistles in your yard are the ones with the pink/lavender flowers that are blooming all around central Texas at this time of year. If you have the ones with yellow or white flowers, go back to that previous answer.
In her book Wildflowers of Texas, Geyata Ajilvsgi includes two thistles with pink/lavender flowers which I take to mean they are among the most common. They are:
Cirsium texanum (Texas thistle) - As you would guess from its name, this is a native thistle
Carduus nutans (nodding thistle) - This is a non-native. It is listed as an invasive plant by both Texasinvasives.org and the USDA. Another common name for it is musk thistle.
These are very similar in appearance. I sought help with identification methods from Minette Marr at the lady Bird Johnson Wildflower Center and she suggested a article published by the Oklahoma Cooperative Extension Service at Oklahoma State University entitled Thistles in Oklahoma and Their Identification.
From the Image Gallery
More Non-Natives Questions
When (and whether) to plant non-native red-tip photinia in Austin
October 30, 2011 - With the current and forecast drought I'm wondering if the usual rules about when to plant might change. I'd like to plant red-tip photinia.
view the full question and answer
Care for indoor Lemon Cypress
November 30, 2008 - How do I care for an indoor Lemon Cypress tree?
view the full question and answer
Correct spelling of Passiflora caerulea
August 07, 2007 - What is correct, passiflora coerulea or caerulea ?
view the full question and answer
Habiturf for Round Rock TX
March 17, 2013 - Topic Habiturf. We have just aerated our lawn. We were planning on throwing out bermudagrass seed. We already have bermudagrass as well as many weeds in the lawn especially the blue stem clump grass w...
view the full question and answer
Non-native Mandevilla care
March 08, 2006 - I have a mandevilla and it looks like there are about 5 plants in one pot. Can it be separated without killing it? And, if it can be separated how should it be done? The plant is about 7" high and i...
view the full question and answer
| Support the Wildflower Center by Donating Online or Becoming a Member today. |